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17. Conditionals

Conditional clauses consist of two parts: the if-clause (hypothesis) and the main clause (result).

Type 0

general

truth

If-clause (hypothesis)

Main clause (result)

Use

if/when + present simple

present simple

something which is always true, laws of nature

If you mix red and yellow, you get orange.

Type 1 real

(present

future)

if + present simple, present continuous, present perfect or present perfect continuous

future/imperative can/may/might/must/ should/ could + bare infinitive

something real - likely to happen in the present or future

If he doesn’t study, he will fail his exams.

If you need money, let me know.

If you have cleaned your room, you can watch TV. If you’re in town, you should call us.

Type 2 unreal

(present)

if + past simple or past continuous

would/could/might + bare infinitive

imaginary situation contrary to facts in the present; also used to give advice

If 1 had free time, I would join a gym.

BUT: I don’t have free time, (untrue in the present) (advice)

If I were rich. I’d buy a mansion.

BUT: I’m not rich, (untrue in the present)

Type 3 unreal

(past)

if + past perfect

would/could/might + have +past participle

a condition in the past that did not happen

If I had found her address, I would have sent her an invitation. (Sometime in the past, I wanted to send an invitation to a friend. I didn't find her address, however. So in the end I didn't send her an invitation.)

If John had had the money, he would have bought a Ferrari.

(I knew John very well and I know that he never had much money, but he loved Ferraris. He would have loved to own a Ferrari, but he never had the money to buy one.)

  • When the if-clause comes before the main clause, the two clauses are separated with a comma. When the main clause comes before the if-clause, then no comma is necessary.

If I have time today, I will answer my emails.

I will answer my emails if I have time today.

  • We can use were instead of was for all persons in the if-clause of Type 2 conditionals.

If Sandy was/were here, we could play a card game.

Unless means if not.

You’ll be late unless you leave now. You’ll be late if you don’t leave now.

We use if to say that something might happen.

We use when to refer to the time that something will definitely happen.

If you phone Kevin, will you ask him for directions? (You might phone Kevin.)

When you phone Kevin, will you ask him for directions? (It is certain that you will phone him.)

Time Clauses

  • We do not use the future simple after: while, before, until, as soon as, after, if and when. We use the present simple

instead.

Stand here until you see him come out of the shop. (NOT: ... until you will see him come out of the shop.)

  • men can be used with the future simple if it is used as a question word.

When will you visit your grandmother?

I’m not sure when Bob will arrive.

  • When is followed by the present simple if it is used as a time word.

Send me an email when you get home from school.